Zoe has 3 times as many marbles as Barbara. Barbara has
37 as many marbles as Dana. If the three of them have a total of 57 marbles, how many marbles does Zoe have?
Zoe |
Barbara |
Dana |
3x3 |
1x3 |
|
|
3x1 |
7x1 |
9 u |
3 u |
7 u |
The number of marbles that Barbara has is repeated. Make the number of marbles that Barbara has the same. LCM of 1 and 3 is 3.
Total number of marbles that the three of them have
= 9 u + 3 u + 7 u
= 19 u
19 u = 57
1 u = 57 ÷ 19 = 3
Number of marbles that Zoe has
= 9 u
= 9 x 3
= 27
Answer(s): 27